On the possibility to improve heat transfer of a sphere by natural convection and water mist

Abed, Akram H.; Klimova, V. A.; Щеклеин, С. Е.; Pakhaluev, V. M.

doi:10.1088/1742-6596/1382/1/012124

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…The intensification of heat transfer by water drops can include four main physical processes [16,17]: evaporation of water microdroplets on the surface of cylinders, evaporation of a water film on the surface of cylinders, convective heat transfer, and a decrease in air temperature due to an increase in its humidity.…”

Section: Resultsmentioning

confidence: 99%

“…While analyzing the heat exchange between the flow of fine-air water mist and the heated surface, it is usually considered the total quantity of heat which is transferred by the air and water mixture, and the heat which is expended for the water heating and evaporation [16,17]:…”

Section: Methodsmentioning

confidence: 99%

“…The majority of published researches of enhancement of dry cooling methods thermal efficiency considers the variants with forced air movement and humidifying by water micro-drops (aerosol) [7][8][9][10][11][12][13]. This way of cooling increases significantly the efficiency of heat exchange, at the same time reducing the amount of water fed to the cooling air [14][15][16], but it demands the additional expenditure of energy for air-supply blowers' drive.…”

Section: Introductionmentioning

confidence: 99%

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Water-air aerosol cooling of rows of cylindrical elements under conditions of natural convection

Abed,

Shcheklein,

Klimova

2023

E3S Web Conf.

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The article notes the disadvantages of application of dry cooling towers and air-cooled condensers for heat elimination. The cooling air humidifying is considered as a prevalent method of these heat removers efficiency increasing. The way of heat-transfer coefficient rise is proposed using the water mist which enables the latent heat of water evaporation. The physical process of cooling with water mist is analyzed. The effect of water mist rate on the heat transfer enhancement is investigated experimentally in conditions of natural convection. The experimental facility with a heated tube bundle and transversal flow is described. The results of the experiments are given in the form of Nusselt number depending on Rayleigh number and water mist rate.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water-air aerosol cooling of rows of cylindrical elements under conditions of natural convection

Abed,

Shcheklein,

Klimova

2023

E3S Web Conf.

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“…This phenomenon is one of the typesof thermal transfer and it was found that there are many works that focus on the study of the heat transfer by natural convection of fluid flow due to a sphere under various physical conditions. Recently, Abed et al [10] estimated the water mist impacts enhance the heat transfer with natural convection around the sphere. A numerical study of natural convection boundary layer flow of Carreau non-Newtonian fluid over an isothermal sphere in the presence of a magnetic field with slip and jump conditions has been prepared by Amanulla et al [11] .…”

Section: Introductionmentioning

confidence: 99%

Laminar MHD natural convection flow due to non-Newtonian nanofluid with dust nanoparticles around an isothermal sphere: Non-similar solution

Mohamed¹,

Hady²,

Mahdy³

et al. 2021

Phys. Scr.

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The focus of this paper is to examine non-similar solutions of dusty non-Newtonian Casson nanofluid flow around the surface of an isothermal sphere in the presence of magnetic field impact. It is presupposed that the impacts of thermophoresis and Brownian motion are considered into regard in the nanofluid model. In addition to the thermophoresis impact, the normal flux of nanoparticles is equal to zero at the boundary. With respect to the fluid temperature, the surface of the isothermal sphere is preserved at a constant temperature. The dust particles preassumed to having the same size and conform in the spherical shape to the nanoparticles. Suitable non-similarity transformations are utilized to mutate the governing partial differential equations for fluid and dust phases into a system of non-linear, coupled, and non-similar partial differential equations. The generated non-similar equations are solved using numerical technique renown MATLAB function bvp4c and the results are represented in terms of velocity and temperature of fluid and dust phases, and concentration distribution as well as the skin-friction coefficient and heat transfer rate. Obtained results indicate that increasing the mass concentration of the dust particles in the nanofluid leads to depression the motion and an enhancement in the rate of heat transfer. For the nanofluid phase and dust particle phase, the temperature magnitude improves with increasing of the stream wise coordinate additionally the distribution of velocity accelerates away from the sphere surface i.e. with high values of the radial coordinate η. Nomenclature a Radius of the sphere (m) B 0 Constant of magnetic field (kg −1 s −2 A −1 ) C Dimensional concentration C f Skin-friction coefficient c p Specific heat at constant pressure (J/kgK) c s Specific heat of particle phase (J/kgK) D B Brownian diffusion coefficient (m 2 s −1 ) D T Thermophoretic diffusion coefficient (m 2 s −1 ) D ρ Mass concentration of the dust particle Ec Eckert number e ij Deformation rate component f Dimensionless stream function for fluid velocityRECEIVED

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“…In this study, a water droplet cooling technique or (water mist cooling technique) were developed by suspending fine water droplets into the working fluid. The water mist techniques, not a new cooling concept and has been successfully applied in many industrial applications [13][14][15][16][17][18]. Utilizing water mist as a cooling medium provides excellent cooling approaches to dissipate heat even larger than the single-phase air cooling approaches.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation in Improving Thermal Performance of Passive Heat Removal System using Mist Assisted Evaporative Cooling

Abed¹,

Щеклеин²,

Pakhaluev³

2020

ARFMTS

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Demands to increase the safety and reliability of the modern nuclear reactors are constantly being made. Typical demands include the increases the thermal performance of the passive heat removal system PHRS by removing larger amounts of energy and applied a technique that leads to reduce size and weight of the PHRS unit. This article presents an experimental investigation on the natural convection based on alternative cooling approach using water mist. The results obtained from the related experimental work indicated that the heat transfer rate was enhanced over that for the airflow as a result of water mist evaporation on the surface of the tubes. The Nu number increases by about 148%, 144%, and 128% respectively for all tube rows compared with airflow. The experimental results of the thermal performance factor values obtained by suspended water mist were correlated as functions of Rayleigh number (Ra) and Weber number (We). Subsequently, the predicted thermal performance factor from the correlation was plotted to compare with the experimental data. It was found that the thermal performance factor was within ±11%.

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On the possibility to improve heat transfer of a sphere by natural convection and water mist

Cited by 5 publications

References 5 publications

Water-air aerosol cooling of rows of cylindrical elements under conditions of natural convection

Water-air aerosol cooling of rows of cylindrical elements under conditions of natural convection

Laminar MHD natural convection flow due to non-Newtonian nanofluid with dust nanoparticles around an isothermal sphere: Non-similar solution

Experimental Investigation in Improving Thermal Performance of Passive Heat Removal System using Mist Assisted Evaporative Cooling

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